Available with us is 277 V relay / thermostat & room sensor kit, manufactured by TPI. Model 3900LV277T comprises of a room sensor that can be directly mounted flush to a vertical surface or standard 2" x 4" electrical mounting enclosure. It also has unique relay design that permits solid state proportional and integral temperature control. The This remarkable unit is used with 3900 series hydronic and architectural style electric baseboard heaters.